ive replaced them before, use a razor blade underneath the trim both sides, its a 29 you say so shouldnt be too hard, just patience. seems 75 gallon and over tanks they become alot harder to get the trim off. but razor blade outside under trim and inside and just keep going back and forth. once thats off vinegar cleaning and getting rid of the rest of the silicone before putting new trim on is advisable. Ive used a sawall on some, i dont reccomend it, but ive done it on the larger tanks just because i dont have patience.